Bug 70967

Summary:	Performance regression from cgroup refactoring makes dense boxes nearly unbootable
Product:	systemd	Reporter:	David Strauss <david>
Component:	general	Assignee:	systemd-bugs
Status:	RESOLVED FIXED	QA Contact:	systemd-bugs
Severity:	critical
Priority:	medium
Version:	unspecified
Hardware:	All
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description David Strauss 2013-10-28 18:25:10 UTC

Having at least few thousand units can add hours to boot time.

We don't have any firm answers yet, but there's a thread here:
http://lists.freedesktop.org/archives/systemd-devel/2013-October/013765.html

It looks like the worst case is a Xen VM because of hypervisor memory management interaction. Like the bottleneck with daemon-reload, key problems seem to be with hashmap_iterate. We've mostly tested with v208, but the changes occurred in v205, the first version to ship after Fedora 19.

Comment 1 David Strauss 2013-10-28 19:41:52 UTC

Joe (also on the mailing list thread) pointed out that I missed Lennart's reply somehow and the addition to the TODO list. Marking this resolved here.

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